data regarding heights of students of class 10thof model school,dehradunis given bellow:
height 150-156 156-162 162-168 168-174 174-180
no.students 4 7 15 8 6
find mean height.

HeightMid-values xiFrequency fidi=xi-165    ui=di6fiui150-1561534-12-2-8156-1621597-6-1-7162-16816515000168-1741718618174-180177612212Now,A=165, h=6, N=fi=40 and fiui=5Mean=A+h1Nfiui=165+6140×5=165+0.75=165.75Hence mean height s 165.75

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